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Old 11-26-2007, 10:49 PM
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cast iron headers

My gen v 454 exhaust manifolds have lumps cast on the top inside of the header. Another set of big block manifolds have the same type of material but they are drilled (for air injection?) but these ones are out of a truck and are not drilled and tapped. My question is whether I should grind them out for better flow.

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Old 11-26-2007, 11:53 PM
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You can, but it won't do much good. For the cost of a good set of headers you can gain way more good flow. Manifolds are bare minimum flow. The best you can do with stock manifolds is port them, but the work involved for the minimal increase in power isn't worth it.

If they're off and you have some abrasives, go for it, but don't expect more than 2 hp or so. For the work involved and the cost of abrasives, you'll never feel a difference. Save up for headers.
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